Question

In mohls half leaf experiment why do we pour koh into glass jar

Answer 1

KOH (Potassium Hydroxide) absorbs carbon dioxide. The leaf inside the bottle containing KOH solution does not become blue black when compared with the leaf which is exposed to atmospheric air. This shows that carbon dioxide is ecessary for photosynthesis.

Answer 2

The Mohls half leaf experiment involves following:

• The potassium hydroxide solution is very strong absorber of carbon dioxide.  
• The Mohls experiment with half leaf inside the glass jar is best to explain the above property of potassium hydroxide.  
• The half leaf is  kept inside solution for 48-72 hours, this is kept in sunlight for some duration,  
• The starch test on leaf reveals leaf for negative test for inside portion of leaf which gives the evidence of absorption of entire carbondioxide from the bottle by KOH solution.
• Hence this proves that plant requires the enough carbondioxide to survive .